 
      // 获取元素
      var disc = document.getElementsByClassName("disc")[0];
      var hourHand = document.getElementsByClassName("hourHand")[0];
      var minuteHand = document.getElementsByClassName("minuteHand")[0];
      var secondHand = document.getElementsByClassName("secondHand")[0];
      var scale = document.getElementsByClassName("scale");

      // 生成刻度
      for (var i = 0; i < 60; i++) {
        var scale = document.createElement("div");
        scale.classList.add("scale");
        scale.style.transform = `translate(-50%) rotate(${i * 6}deg)`;
        disc.appendChild(scale);
        scale.style.transform = `translate(-50%) rotate(${i * 6}deg)`;
        if (i % 5 === 0) {
          scale.style.width = 4 + "px";
          scale.style.height = 12 + "px";
        }
      }

      // 生成数字
      for (var i = 0; i < 12; i++) {
        var num = document.createElement("div");
        var numx = document.createElement("span");
        num.classList.add("num");
        num.style.transform = `translate(-50%) rotate(${i * 30 + 30}deg)`;
        numx.style.transform = `rotate(${-i * 30 - 30}deg)`;
        numx.innerHTML = i + 1;
        disc.appendChild(num);
        num.appendChild(numx);
      }

      // 浏览器刚打开就显示，不会停顿
      var h = getTime().hours;
      h = h > 12 ? h - 12 : h;
      hourHand.style.transform = `rotate(${
        h * 30 - 180 + getTime().minute * 0.5
      }deg)`;
      minuteHand.style.transform = `rotate(${getTime().minute * 6 - 180}deg)`;
      secondHand.style.transform = `rotate(${getTime().second * 6 - 180}deg)`;

      // 定时器，每过一秒执行一次
      setInterval(function () {
        var h = getTime().hours;
        h = h > 12 ? h - 12 : h;
        hourHand.style.transform = `rotate(${
          h * 30 - 180 + getTime().minute * 0.5
        }deg)`;
        minuteHand.style.transform = `rotate(${getTime().minute * 6 - 180}deg)`;
        secondHand.style.transform = `rotate(${getTime().second * 6 - 180}deg)`;
      }, 1000);

      // 函数：获取时间
      function getTime() {
        var date = new Date();
        var year = date.getFullYear();
        var month = date.getMonth();
        month = month < 10 ? "0" + month : month;
        var day = date.getDate();
        day = day < 10 ? "0" + day : day;
        var week = date.getDay();
        var weeks = ["日", "一", "二", "三", "四", "五", "六"];
        var weekZn = weeks[week];
        var hou = date.getHours();
        hou = hou < 10 ? "0" + hou : hou;
        var min = date.getMinutes();
        min = min < 10 ? "0" + min : min;
        var sec = date.getSeconds();
        sec = sec < 10 ? "0" + sec : sec;
        return {
          year: year,
          month: month,
          day: day,
          week: weekZn,
          hours: hou,
          minute: min,
          second: sec,
        };
      }
     